linux-kernel - Re: [patch] x86, bts: use atomic memory allocation

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Date:	Fri, 20 Mar 2009 09:37:35 +0100
From:	Andi Kleen <ak@...ux.intel.com>
To:	"Metzger, Markus T" <markus.t.metzger@...el.com>
CC:	Ingo Molnar <mingo@...e.hu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"hpa@...or.com" <hpa@...or.com>,
	"markus.t.metzger@...il.com" <markus.t.metzger@...il.com>,
	"roland@...hat.com" <roland@...hat.com>,
	"eranian@...glemail.com" <eranian@...glemail.com>,
	"oleg@...hat.com" <oleg@...hat.com>,
	"Villacis, Juan" <juan.villacis@...el.com>,
	"ak@...ux.jf.intel.com" <ak@...ux.jf.intel.com>
Subject: Re: [patch] x86, bts: use atomic memory allocation


> 
> When I boot that configuration (without the additional patches), I get some
> error dumps on the screen including a call trace. Unfortunately, the interesting
> part scrolls out of the top of my screen and the boot stops.

Standard ways to handle that:
- boot with vga=0x0f07 to get smaller fonts (if it doesn't work use vga=ask and select suitable number)
- use a serial console, possibly with earlyprintk
- use firescope if the system has a ieee1394 connection. That can access the log buffer. You
need a 1394 cable, but those are easy to get. See Documentation/debugging-via-ohci1394.txt

For this particular case it might be enough to move the selftest to run much later
and then use netconsole or similar after it has been set up.

-Andi
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